Internal-combustion engine



E. c. CORDELL INTERNAL COMBUSTION ENGINE Filed.Dec. 23, 1919 INVENlOl [flu/a rid CCardeZZ,

BY MM 6 1 Patented Aug". 21, 1923.

I neare -.EDWA1%D o; connnrn, or SAN FRANCISCO, cameo aura.

' rn'rnnnen-cotrnus'rronf ENGINE.

Application filed Deceniser 23,1919. s ri rno. 347,048. f i 7 To all whom it may concern: e or Be it known that I, EDWARD C. CoRnnLL, a citizen of the United States, whose residence is San Francisco, .California, and whose post-office address is 886 Mills Building, San Francisco, California, have invented new and useful Improvements in In ternal-Ccmbustion Engines. 7 This invention relates to internal combus 1 tion engines.

The object of the invention is to provide such an internalcombustion engine which will thoroughly scavenge or' exhaust; all burnt products of exploded gases fromthe and thereby eliminating any possibility -of lowering the: eflic'iency of {the incoming gas by admixture-- with chargeof explosive exploded gases. 7

I accomplishithe above by providing an auxiliary piston operating in the combustion chamber abovethemain' piston. within the same cylinder and so synchronized that the ,two pistons are brought together dur- 25 ing the exhaust-:s tr'okeof the main piston and thereby driving out all burnt gasesf 7 With the above and other'objects in View the invention COI1SlSl3S,lIl 2.lI-l1 l1OV6l features of construction, combination and arrange- 3 ment of parts to be hereinafter more fully described, claimed and illustrated in the accompanying drawings, of which;

Figure 1 is an end elevation of. an internal combustion engine illustrating the. preferred embodimentof my invention. 7

Fig. 2 is a central vertical cross sectional view of Fig. 1.

Similar numerals refer to throughout the'several views.

In the drawings I have illustrated the use of my invention as when applied to a four cycle internal combustion engine of the reciprocating type of which 10 is the cylinder and 11 the power piston which is provided with the usual rings 12 and connected to the crank shaft 13 through the connecting rod 14. The crank shaft 13 is suitably housed and mounted within the usual crank case which comprises the sections 15' and 16, and the upper section being provided with an outwardlyextending circular portion 17 the purpose of which will later apear. p Above the main piston 11 and operable within the combustion chamber, I provide an auxiliary piston 18 provided with the similar parts combustion chamber after each explosionusual rings 19 and having a hollowl'stem 20 secured'thereto, The stemextendsthrough" i an opening provided in the headfjof the cylinder and carries a cap member 21 on its" upper end. About the stem is positioneda coil spring 22 adapted yieldingly; hold therpiston 18' in its ra sed, position and against the cylinder head,

stem 20 is provided'wit-ha suitable port20 at'each end in order toprevent the creation of a vacuum inthe" upper part of thejengine cylinder on the downward jstroke .lof;

the auxiliary piston.

Between the raised position of the aux iliarypiston and the extreme upward stroke of the main plston,

;Also the hollow lisuit'ablyarrange in the wallsof the cylinder a spark plug 23. and 1.

anexhaust and intake port 24.

In order to lower the auxiliarypiston at the J proper interval I provide a shaftwhich is driven from the crank shaft.--13' through thereductiongears 26,27 and 23', i I

at one half the speed of the crank shaft,"

Fig. 1. On the shaft 25 there is mounted a cam 26 of substantially theshape as shown in Fig. -2 of the drawings.- 27 issuitably pivoted:onfulcrumed on the cylinder head and on each 7, roller 28 suitably-journaled, one roller being adapted to engage the head 21 of the piston stem 20 and the other roller adapted 'to engage a head 29 provided on the upper endof a connecting rod 30' is suitably mounted for vertical movement and on its lower end there is suit-- ably journaled a roller 31, said roller belower end of the cylinder 32iand in the exterior side wall thereof there is provided an opening which communicates with the pipe connection 34 and sa d connection leading to the carbureter not shown, a'hollow piston 35 provided with suitable rings 'is adapted to operate-in the cylinder "32. In the opposite walls of this piston there is provided the respective openings '36 and 37"and rigidly secured to the lower end end carrying a 7 A rocker arm,

rod 30. The connecting ring adapted to operatively engage the of the piston is a connecting rod 38 which carries a roller 39 on its lower end, suitably journaled and adapted to operatively engage the cam 40, said cam being mounted on the shaft 25. A coil spring ll surrounds the connecting rod 38, its upper end engaging the piston 35 and its lower end engaging an outwardly disposed flange 42 provided on the cylinder 10, and to which the upper portion of the crank case is bolted." The function of the spring is to normally hold the roller '39 in engagement with the cam 40.

' In the operation of the engine'as herein described, assuming that all the parts have the position as shown in Fig. 2. In which instance the piston 11 is in its downward I and intake stroke, the auxiliary piston 18 through the ports 36 and 2%.

stated the shaft 25 rotates at one half the in its raised position, and the valve piston inposition to permit the incoming gas to flow from the connection intothe piston and from thence into the cylinder 10 speed of the crankshaft l3 and consequently upon the compression stroke of the piston 11 the shaft 25' will have rotated i sutiiciently to cause the cam 40 to lower the 0 its greatest throw whi'ch'is sufficient piston enough to close the port 2%. When the compressionstroke of the piston 11 is complete, combustion occurs. Upon the exhaust stroke of the piston the cam 40 exerts to draw 1 the piston 35 below the exhaust and intake port 24 and thereby permit the expulsion of exploded gases from the exhaust 33. Also during the exhaust stroke of the piston 11 i s the cam 26 is in position to lift the rod is before 30 and thereby through the rocker arm 27 lower the auxiliary piston 18 sufiiciently to i 40 meet the piston 11 at the time of its extreme exhaust stroke, and in this'manner all exploded and burnt gases are expelled from the cylinder.. ll hen the'piston 11 again starts on its intake stroke the piston valve will be brought into the position shown in Fig. 2 and the auxiliary piston 18 will as sume its raised position as shown by. the

and normally spaced from the main piston, a I

hollow valveless stem-carried by the auxiliary iston ro'ectin throu -h-the-oenin in the L cylinder head and provided with ports therein, one of said ports opening direct'to the atmosphere, whilethe other port opens to; the space intermediate the auxiliary piston and the cylinder head for rclierin'gi the Vacuum, a rocker arm contacting with-the stem, and means foroperating the rocker arm and main piston "toz'bring the pistons together during the-exhaust stroke of the engine;

Witnesses:

Gno. R. WARREN, I C. PqPnacocx.

- EDWARD 'c. ,coRDELLi j i 

